Pen



FIG. 1 is a back view of the new ornamental pen of the present invention.

FIG. 2 is a left side view of which the right side view is a mirror image thereof.

FIG. 3 is a front view thereof.

FIG. 4 is an enlarged top plan view thereof; and,

FIG. 5 is an enlarged bottom plan view thereof. 

I claim the ornamental design for the pen, as shown and described. 